Rtc Tamper And Alternate Function Configuration Register; (Rtc_Tafcr) - ST STM32F40 Series Reference Manual

RM0090
23.6.17

RTC tamper and alternate function configuration register

(RTC_TAFCR)

Address offset: 0x40
Power-on reset value: 0x0000 0000
System reset: not affected
31 30 29 28
15 14 13 12
TAMP- TAMP-
TAMPFLT[1:0]
PUDIS PRCH[1:0]
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Bit 31:19 Reserved. Always read as 0.
Bit 18 ALARMOUTTYPE: RTC_ALARM output type
0: RTC_ALARM is an open-drain output
1: RTC_ALARM is a push-pull output
Bit 17 TSINSEL: TIMESTAMP mapping
0: RTC_AF1 used as TIMESTAMP
1: RTC_AF2 used as TIMESTAMP
Bit 16 TAMP1INSEL: TAMPER1 mapping
0: RTC_AF1 used as TAMPER1
1: RTC_AF2 used as TAMPER1
Note: TAMP1E must be reset when TAMP1INSEL is changed to avoid unwanted setting of
Bit 15 TAMPPUDIS: TAMPER pull-up disable
This bit determines if each of the tamper pins are pre-charged before each sample.
0: Precharge tamper pins before sampling (enable internal pull-up)
1: Disable precharge of tamper pins
Note:
Bits 14:13 TAMPPRCH[1:0]: Tamper precharge duration
These bit determines the duration of time during which the pull-up/is activated before each
sample. TAMPPRCH is valid for each of the tamper inputs.
0x0: 1 RTCCLK cycle
0x1: 2 RTCCLK cycles
0x2: 4 RTCCLK cycles
0x3: 8 RTCCLK cycles
27 26 25 24
Reserved
11 10 9 8
TAMPFREQ[2:0]
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TAMP1F.
Doc ID 018909 Rev 4
23 22 21 20
7 6 5 4
TAMPT TAMP2
S -TRG
Reserved
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Real-time clock (RTC)
19 18 17
ALARMOUT TSIN
TYPE SEL
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3 2 1
TAMP2 TAMP1
TAMPIE
E TRG
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658/1422
16
TAMP1
INSEL
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0
TAMP1
E
rw